Georg Seelig, David Soloveichik, David Yu Zhang, and Erik Winfree
Science 8 December 2006: 1585-1588.
Single-stranded DNAs are used to create a series of computation gates, circuits, and devices in a modular fashion.
Abstract »| Full Text »| PDF »| Supporting Online Material »|
Microwave-Induced Cooling of a Superconducting Qubit
Sergio O. Valenzuela, William D. Oliver, David M. Berns, Karl K. Berggren, Leonid S. Levitov, and Terry P. Orlando
Science 8 December 2006: 1589-1592.
A microwave cooling technique can lower the temperature of a qubit to 3 millikelvin, much lower than the temperature of the surrounding bath, enhancing its stability.
Abstract »| Full Text »| PDF »| Supporting Online Material »|
U-Pb Isotopic Age of the StW 573 Hominid from Sterkfontein, South Africa
Joanne Walker, Robert A. Cliff, and Alfred G. Latham
Science 8 December 2006: 1592-1594.
Dating of cave deposits establishes the australopithicine "little foot," as 2.2 million years old, surprisingly recent and contemporaneous with tool-using Homo species.
Abstract »| Full Text »| PDF »| Supporting Online Material »|
A Complex Oscillating Network of Signaling Genes Underlies the Mouse Segmentation Clock
Mary-Lee Dequéant, Earl Glynn, Karin Gaudenz, Matthias Wahl, Jie Chen, Arcady Mushegian, and Olivier Pourquié
Science 8 December 2006: 1595-1598.
Published online 9 November 2006 [DOI: 10.1126/science.1133141] (in Science Express Reports)
The segmentation clock, which forms repeated body structures during development, generates many oscillating RNAs that regulate common developmental pathways.
Abstract »| Full Text »| PDF »| Supporting Online Material »|
Carbon-Negative Biofuels from Low-Input High-Diversity Grassland Biomass
David Tilman, Jason Hill, and Clarence Lehman
Science 8 December 2006: 1598-1600.
Sustainable, higher-diversity grasslands with low-fertility soils can yield more biomass and consume more CO2 than equal acreages planted with monocultured biofuel sources.
Abstract »| Full Text »| PDF »| Supporting Online Material »|
Synthesis-Mediated Release of a Small RNA Inhibitor of RNA Polymerase
Karen M. Wassarman and Ruth M. Saecker
Science 8 December 2006: 1601-1603.
When bacteria are starved, a small RNA inhibits transcription by folding to mimic a legitimate promoter target, after which adding nucleotides can restart transcription.
Abstract »| Full Text »| PDF »| Supporting Online Material »|
Dual Infection with HIV and Malaria Fuels the Spread of Both Diseases in Sub-Saharan Africa
Laith J. Abu-Raddad, Padmaja Patnaik, and James G. Kublin
Science 8 December 2006: 1603-1606.
Malaria infection increases HIV blood levels and HIV patients are more susceptible to malaria, a synergy that probably contributes to the HIV epidemic in Africa.
Abstract »| Full Text »| PDF »| Supporting Online Material »|
A Positive Feedback Loop Promotes Transcription Surge That Jump-Starts Salmonella Virulence Circuit
Dongwoo Shin, Eun-Jin Lee, Henry Huang, and Eduardo A. Groisman
Science 8 December 2006: 1607-1609.
Activation of a two-component signaling pathway required for Salmonella virulence triggers a burst of transcription that may allow rapid adaptation to new conditions.
Abstract »| Full Text »| PDF »| Supporting Online Material »|
Sequential Interplay of Nicotinic and GABAergic Signaling Guides Neuronal Development
Zhaoping Liu, Robert A. Neff, and Darwin K. Berg
Science 8 December 2006: 1610-1613.
Acetylcholine changes chloride transporter levels, triggering a switch from excitatory to inhibitory signaling in the embryonic chick brain.
Abstract »| Full Text »| PDF »| Supporting Online Material »|
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